Lyles was 1-0 with a 3.31 ERA in 11 appearances for the Brewers late last season, helping Milwaukee win the NL Central. He agreed to a $2.05 million, one-year contract with the Pirates and earned a rotation spot, going 5-7 with a 5.36 ERA. He won five of his first six decisions with Pittsburgh but has a 9.58 ERA in eight starts since May 28.

Lyles was scheduled to start for Pittsburgh on Monday night against Cincinnati and was replaced by Alex McRae (0-2, 7.71). The Pirates are 2-14 since the All-Star break, falling out of contention.

Ponce, a second-round pick in the 2015 amateur draft, is 1-3 with one save, 44 strikeouts and a 3.29 ERA in 27 appearances at Double-A Biloxi this season.

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